"All of those questions, messages, and stern commands that people have been whispering to Siri are stored on Apple servers for up to two years, Wired can now report. Yesterday, we raised concerns about some fuzzy disclosures in Siri's privacy policy. After our story ran, Apple spokeswoman Trudy Muller called to explain Apple's policy, something privacy advocates have asking for." Apple cares about your privacy.

Your really missing my point, which was just because a corporation says something is annonymized doesn't necessarily mean it is. That's all there was to it.

Edit: Your post gives me the impression that you are only considering privacy from hackers. But one's privacy can also be breached by insiders and court orders. If you've got a tin foil hat on: conceivably some countries would love to conduct blanket searches if they could get their hands on the data (illicitly or otherwise) to conduct witch-hunts. I am not familiar with Siri's T&Cs, but it certainly would not have been obvious to me that the service was archiving user voice records on apple's servers. It's not really any worse than other kinds of records like you said, but we should recognize that there is a risk that's greater than zero.